android listView 根据字母排序和定位 （http://www.apkbus.com/android-69999-1-1.html）

第一步是实现字母的a-z的控件的显示：
import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.drawable.ColorDrawable;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.widget.HeaderViewListAdapter;

import android.widget.ListView;

import android.widget.SectionIndexer;

import android.widget.TextView;

 

public class SideBar extendsView {

    privatechar[] l;

    privateSectionIndexer sectionIndexter =null;

    privateListView list;

    privateTextView mDialogText;

    Bitmap mbitmap;

    privateinttype = 1;

    privateintcolor = 0xff858c94;

 

    publicSideBar(Context context) {

        super(context);

        init();

    }

 

    publicSideBar(Context context, AttributeSet attrs) {

        super(context, attrs);

        init();

    }

 

    privatevoidinit() {

 

        l =newchar[] {'!','A','B','C','D','E','F','G','H',

         'I','J','K','L','M','N','O','P','Q','R','S','T','U','V',

          'W','X','Y','Z','#'};

        mbitmap = BitmapFactory.decodeResource(getResources(),

                R.drawable.scroll_bar_search_icon);

    }

 

    publicSideBar(Context context, AttributeSet attrs,intdefStyle) {

        super(context, attrs, defStyle);

        init();

    }

 

 

    publicvoidsetListView(ListView _list) {

        list = _list;

        HeaderViewListAdapter ha = (HeaderViewListAdapter) _list

                .getAdapter();

        MyAdapter ad = (MyAdapter)ha.getWrappedAdapter();

        sectionIndexter = (SectionIndexer) ad;

         

    }

 

    publicvoidsetTextView(TextView mDialogText) {

        this.mDialogText = mDialogText;

    }

 

    publicbooleanonTouchEvent(MotionEvent event) {

 

        super.onTouchEvent(event);

        inti = (int) event.getY();

 

        intidx = i / (getMeasuredHeight() / l.length);

        if(idx >= l.length) {

            idx = l.length -1;

        }elseif(idx < 0) {

            idx =0;

        }

        if(event.getAction() == MotionEvent.ACTION_DOWN

                || event.getAction() == MotionEvent.ACTION_MOVE) {

            setBackgroundResource(R.drawable.scrollbar_bg);

            mDialogText.setVisibility(View.VISIBLE);

            if(idx ==0) {

                mDialogText.setText("Search");

                mDialogText.setTextSize(16);

            }else{

                mDialogText.setText(String.valueOf(l[idx]));

                mDialogText.setTextSize(34);

            }

            if(sectionIndexter ==null) {

 

             

 

                sectionIndexter = (SectionIndexer) list.getAdapter();

                 

            }

            intposition = sectionIndexter.getPositionForSection(l[idx]);

 

            if(position == -1) {

                returntrue;

            }

            list.setSelection(position);

        }else{

            mDialogText.setVisibility(View.INVISIBLE);

 

        }

        if(event.getAction() == MotionEvent.ACTION_UP) {

            setBackgroundDrawable(newColorDrawable(0x00000000));

        }

        returntrue;

    }

 

    protectedvoidonDraw(Canvas canvas) {

        Paint paint =newPaint();

        paint.setColor(color);

        paint.setTextSize(12);

        paint.setStyle(Style.FILL);    

        paint.setTextAlign(Paint.Align.CENTER);

        floatwidthCenter = getMeasuredWidth() /2;

        if(l.length >0) {

            floatheight = getMeasuredHeight() / l.length;

            for(inti = 0; i < l.length; i++) {

                if(i ==0 && type != 2) {

                    canvas.drawBitmap(mbitmap, widthCenter -7, (i +1)

                            * height - height /2, paint);

                }else

                    canvas.drawText(String.valueOf(l[i]), widthCenter,

                            (i +1) * height, paint);

            }

        }

        this.invalidate();

        super.onDraw(canvas);

    }

}

第二步：设计XML
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
 
    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:divider="@null" />
 
    <com.example.listsildedel.SideBar
        android:id="@+id/sideBar"
        android:layout_width="25dp"
        android:layout_height="wrap_content"
        android:layout_gravity="right|center_vertical" />
 
</FrameLayout>

第三步：继承BaseAdapter并实现SectionIndexer接口，并且Item是通过当字母重复的时候进行隐藏 ，不重复时显示。


import java.util.List;

 

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.SectionIndexer;

import android.widget.TextView;

 

public class MyAdapter extendsBaseAdapterimplementsSectionIndexer{

 

    privateList<Content> list =null;

    privateContext mContext;

    privateSectionIndexer mIndexer;

     

    publicMyAdapter(Context mContext, List<Content> list) {

        this.mContext = mContext;

        this.list = list;

 

    }

 

    publicintgetCount() {

        returnthis.list.size();

    }

 

    publicObject getItem(intposition) {

        returnnull;

    }

 

    publiclonggetItemId(intposition) {

        returnposition;

    }

 

    publicView getView(finalintposition, View view, ViewGroup arg2) {

        ViewHolder viewHolder =null;

        if(view ==null) {

            viewHolder =newViewHolder();

            view = LayoutInflater.from(mContext).inflate(R.layout.item,null);

            viewHolder.tvTitle = (TextView) view.findViewById(R.id.title);

            viewHolder.tvLetter = (TextView) view.findViewById(R.id.catalog);

            view.setTag(viewHolder);

        }else{

            viewHolder = (ViewHolder) view.getTag();

        }

        finalContent mContent = list.get(position);

        if(position ==0) {

            viewHolder.tvLetter.setVisibility(View.VISIBLE);

            viewHolder.tvLetter.setText(mContent.getLetter());

        }else{

            String lastCatalog = list.get(position -1).getLetter();

            if(mContent.getLetter().equals(lastCatalog)) {

                viewHolder.tvLetter.setVisibility(View.GONE);

            }else{

                viewHolder.tvLetter.setVisibility(View.VISIBLE);

                viewHolder.tvLetter.setText(mContent.getLetter());

            }

        }

     

        viewHolder.tvTitle.setText(this.list.get(position).getName());

         

        returnview;

 

    }

     

 

 

    finalstaticclass ViewHolder {

        TextView tvTitle;

        TextView tvLetter;

    }

 

 

    publicObject[] getSections() {

        // TODO Auto-generated method stub

        returnnull;

    }

 

    publicintgetSectionForPosition(intposition) {

         

        return0;

    }

 

    publicintgetPositionForSection(intsection) {

        Content mContent;

        String l;

        if(section =='!') {

            return0;

        }else{

            for(inti = 0; i < getCount(); i++) {

                mContent = (Content) list.get(i);

                l = mContent.getLetter();

                charfirstChar = l.toUpperCase().charAt(0);

                if(firstChar == section) {

                    returni +1;

                }

 

            }

        }

        mContent =null;

        l =null;

        return-1;

    }

}

第四步： activity的实现：

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

 

import android.app.Activity;

import android.content.Context;

import android.graphics.PixelFormat;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.WindowManager;

import android.widget.LinearLayout.LayoutParams;

import android.widget.ListView;

import android.widget.TextView;

 

public class MainActivity extendsActivity {

 

    privateListView mListView;

    privateSideBar indexBar;

    privateWindowManager mWindowManager;

    privateTextView mDialogText;

    privateView head;

 

    @Override

    publicvoidonCreate(Bundle savedInstanceState) {

         //启动activity时不自动弹出软键盘

        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mListView = (ListView)this.findViewById(R.id.list);

        indexBar = (SideBar) findViewById(R.id.sideBar);

        mDialogText = (TextView) LayoutInflater.from(this).inflate(R.layout.list_position,null);

        head = LayoutInflater.from(this).inflate(R.layout.head,null);

        mListView.addHeaderView(head);

        mDialogText.setVisibility(View.INVISIBLE);

        mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

        WindowManager.LayoutParams lp =newWindowManager.LayoutParams(

                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,

                WindowManager.LayoutParams.TYPE_APPLICATION,

                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE

                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,

                PixelFormat.TRANSLUCENT);

        mWindowManager.addView(mDialogText, lp);

        indexBar.setTextView(mDialogText);

        //初始化数据

        List<Content> list =newArrayList<Content>();

        for(inti = 0; i <10; i++) {

            Content m;

            if(i <3)

                m =newContent("A","选项"+ i);

            elseif(i < 6)

                m =newContent("F","选项"+ i);

            else

                m =newContent("D","选项"+ i);

            list.add(m);

        }

        //根据a-z进行排序

        Collections.sort(list,newPinyinComparator());

        // 实例化自定义内容适配类     

        MyAdapter adapter =newMyAdapter(this, list);

        // 为listView设置适配

        mListView.setAdapter(adapter);

        //设置SideBar的ListView内容实现点击a-z中任意一个进行定位

        indexBar.setListView(mListView);       

    }

 

}